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JAMES A. PARTRIDGE, OF LOWELL, MASSACHUSETTS, ASSIGN OR TOl HIMSELF .ANDAE. D. WRIGHT, OF SAME PLAGE.

Letters Patent No. 63,935, dated April 16, 1867.

IMPROVEMENT in warmers.

@in Stimuli rifertci tu in tlgrse tctiets iitmt mit making mt nf tigesame.

To ALL WHOM IT MAY CONOERN:

Be it known that I, JAMES A. Pnnrnrnca, of Lowell, in the county ofMiddlesex, and State of Massachu-v setts, have invented certain new anduseful Improvements in Wrenches, of which the following is afull, clear,

and exact description, reference beingvhad to the accompanying drawings,making part of this specification, inI

which-- Figure 1 is a central longitudinal section. g

Figure 2, a transverse section on the line A B of fig. 1.

Figure 3 is a side elevation, and

Figure 4 a central longitudinal section, showing the operating end ofthe liberating lever depressed, and the segmentary nut disengaged fromthe adjusting-screw. g

This invention consists, first, in the use and application to anordinary slide-wrench of a liberatingrlever, A, arranged in the movablejaw B, when said lever is provided with a segmental nut consisting ofscrew-threads `e formed in or upon the inner or-semcrcular side of thatend Z1 of' the lever which comes in contact with the adjusting-screw G,said lever being pivoted at a, and the segmental nut held in contactwith the adjustingscrew, by means of a spiral or other sp1-ing, g,placed in a socket in the movable jaw, or between said jaw and Vthe end0l of the lever. My invention also consists in forming or providing ashoulder, el, on )the inner portion of the movable jaw, and acorresponding shoulder, e2, on the lever, so that when the segmental nutengages with the adjusting-screw, the said shoulders shall cometogether, and take the strain off the pivot a, whenthe Wrench is beingused to turna. nut or hold a bolt, or for other purposes, therebypreventing the pivot being broken and the wrench'disabled. And myinvention consists in the deep-cut surface'of quadrilateral figures, onthe periphery of the head C of the adjusting-screwthe object of whichisto prevent the surface wearing so smooth by constant use as to renderit difficult to turn the screwby friction applied to the head. Any smalladjustment of my .improved wrench is made by turning the screw, as inthe ordinary slide-wrench, which has nc liberating lever; ibut to adjustthe movablejaw quickly to fit any object within the capacity ofthewrench, it is only necessary to 4press on the end d of the liberatinglever, when the segmental nut at the endrbof said lever will be thrownout of contact with the screw G, as clearly shown in iig. 4, and themovable jaw may be slid along on the smooth shank D of the wrench to anydesired place; releasing the pressure on the end d of the lever, allowsthe spring g to throw the segmental nut into contact with the screw, andhold the movable jaw against one side of the object grasped by the twojaws ofthe wrench.

Having fully described my invention, what I claim as new, and desire tosecure hy Letters Patent, is 1. The liberating lever A, applied to themovable jaw of a slide-wrench, when said lever has a segmental nutformed in the end Z thereof, to engage with the screw Gr, and a spring,g, at or near the end d, to throw theA nut into contact with the screw,and all arranged to operate substantially as and for the purposesetforth.

2. The shoulders el and e2, constructed and arranged to operatesubstantially as and for the purpose set forth.

` JAMES A. PARTRIDGE.

Witnesses:

' JOHN E. CRANE, J. S. WHITNEY.

